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On the ion energy distribution of high current arcs in vacuum

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4 Author(s)
Rusteberg, C. ; Inst. fur Elektrische Energieanlagen, Tech. Univ. Braunschweig, Germany ; Lindmayer, M. ; Juttner, B. ; Pursch, H.

With the experiments presented in this paper, applications of a retarding field analyzer (RFA) for the measurement of the ion energy E i in a vacuum arc plasma are discussed. The examined plasma was produced by a sinusoidal half-wave vacuum arc current. The experiments were concentrated on evaluating the plasma parameters at the last three milliseconds before current zero. In a current range from 300 Arms to 10 kArms, the ion energy distributions and their peak values were evaluated. With the increase of the arc current, a decrease of the ion energy was found. By additional investigations of the angular distribution of the ion energies, a transition from a collision dominated interelectrode plasma to a freely expanding plasma was observed, depending on the arc current

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Plasma Science, IEEE Transactions on  (Volume:23 ,  Issue: 6 )